Proving the Fundamental Theorem of Calculus Twice

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SUMMARY

The discussion focuses on proving the Fundamental Theorem of Calculus (FTC) twice to establish the equality \(\int_c^d(\int_a^b f_{x}(x,y)dx)dy = \int_a^b(\int_{c}^{d}f_{x}(x,y)dy)dx\). Participants emphasize the importance of understanding that if \(g(x) = \int_a^x f\), then \(g' = f\). The conversation highlights the necessity of correctly applying the FTC in double integrals and clarifying notation to avoid confusion in the proof process.

PREREQUISITES
  • Understanding of the Fundamental Theorem of Calculus
  • Familiarity with double integrals
  • Knowledge of notation for integrals and derivatives
  • Basic skills in multivariable calculus
NEXT STEPS
  • Study the application of the Fundamental Theorem of Calculus in multivariable contexts
  • Learn about Fubini's Theorem for evaluating double integrals
  • Explore examples of proofs involving double integrals
  • Review the properties of continuous functions and their integrability
USEFUL FOR

Students of calculus, educators teaching multivariable calculus, and mathematicians interested in the applications of the Fundamental Theorem of Calculus.

steelers2147
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Homework Statement


Complete the proof by using the Fundamental Theorem of Calculus TWICE to establish
[tex]\int_c^d(\int_a^b f _{x}(x,y)dx)dy=...=\int_a^b(\int_{c}^{d}f_{x}(x,y) dy)dx[/tex]



Homework Equations


I know that the FTC states that if g(x)=\int_a^x(f), then g'=f


The Attempt at a Solution


I'm not sure how to use this fact to get the proof started. Any guidance would be appreciated.
 
Last edited:
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Fixed your integral. You had [ \tex] rather than [ /tex].
steelers2147 said:

Homework Statement


Complete the proof by using the Fundamental Theorem of Calculus TWICE to establish

[tex] \int_c^d(\int_a^b f _{x}(x,y)dx)dy=...=\int_a^b(\int_{c}^{d}f_{x}(x,y)dy)dx [/tex]



Homework Equations


I know that the FTC states that if g(x)=\int_a^x(f), then g'=f


The Attempt at a Solution


I'm not sure how to use this fact to get the proof started. Any guidance would be appreciated.
 

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